Gravitational field strength has units N kg-1. The magnitude of gravitational field strength can be calculated using Newton's law of gravitation: F = GmM/r2. For a mass m, the gravitational force acting on it equals: mEG. So,

Cancelling m gives:

Where r is the radius from the body's centre. Where the field originates from a sphere it can be assumed that the force acts from a point at its centre. The field strength of the earth increases linearly from its centre to its radius, and from the surface decreases proportionate to the inverse square of the distance from its centre. Also, because the acceleration of a free falling body is equal to: F/m, and g (the gravitational field strength near the earth's surface) is also equal to F/m, acceleration equals the field strength acting on it, g = a.

The electric field strength, E, is the force per unit charge a body exerts on another, much smaller, body. When a body of charge Q has a force F acting on it as a result of the field, the gravitational field strength at that point is defined as:

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